I'm not sure about your meaning, but if you want to do-follow on all links in post content, just leave them as they're, you don't have to do anything. If you want to do-follow on all links in comments, you can search on WordPress.org for plugins to do that (there are many of them). If you want to no-follow on all links, you can try the External Nofollow plugin.
Which things in a blog you want do-follow and nofollow ? Blog links,comments .. ?? Be specific.. DON.
Wordpress is by default having No-Follow attribute. however you can make it do-follow by installing do-follow plugin (google it)
There are 3 right answer, I thing your problem suppose to be fixed now, unless you don't know exactly what you want...